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Residential Whole Loans (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Receivables [Abstract] |  |  |  |
Total residential whole loans | $ 5,900,000,000 |  | $ 5,900,000,000 | $ 7,400,000,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loss on sale of financing receivable | (800,000) |  |  |
Valuation allowance adjustment | 70,181,000 | $ (70,181,000) |  |
Unpaid principal balance of loans | 24,100,000 |  | 24,100,000 |
Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, sale | 955,400,000 |  | 1,800,000,000 |
Realized loss on sale of financing receivable | (127,200,000) |  |  |
Loss on sale of financing receivable |  |  | 273,000,000.0 |
Valuation allowance adjustment | 70,181,000 | (70,181,000) |  |
Purchased Performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, nonaccrual | 171,600,000 |  | 171,600,000 | $ 99,900,000
Purchased Credit Deteriorated Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance adjustment | 0 | $ 0 |  |
Financing receivable, nonaccrual | 122,000,000.0 |  | 122,000,000.0 |
Interest income |  |  | $ 0 |
Non-QM Loans Related to Reversed Valuation Allowance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loss on sale of financing receivable | $ (57,000,000.0) |  |  |

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